<template>
	<view>
		<view class="search-box">
			<my-search bg-color="#007AFF" :border-radius="16" @click="goSearch"></my-search>
		</view>
		
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}" refresher-enabled>
				<view :class="['left-scroll-view-item', index=== active ? 'active' : '']" @click="activeChanged(index)"
					v-for="(item,index) in cateList" :key="index">
					{{item.cat_name}}
				</view>

			</scroll-view>
			<!-- 右侧的滚动视图区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<!-- 二级列表 -->
				<view class="cate-lv2" v-for="(val,idx) in cateLevel2" :key="idx">
					<view class="cate-lv2-title">
						{{val.cat_name}}
					</view>
					<!-- 三级列表 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(val2,idx2) in val.children" :key="idx2" @click="goList(val2)">
							<image :src="val2.cat_icon">

							</image>
							<text>{{val2.cat_name}}</text>
						</view>
					</view>
				</view>

			</scroll-view>
		</view>
	</view>
</template>
<script>
	export default {
		data() {
			return {
				wh: 0,
				cateList: [],
				active: 0,
				cateLevel2: [],
				 scrollTop: 0
			};
		},
		onLoad() {
			// 获取当前系统的信息
			const sysInfo = uni.getSystemInfoSync()
			// 为 wh 窗口可用高度动态赋值
			this.wh = sysInfo.windowHeight-50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 判断是否获取失败
				if (res.meta.status !== 200) return uni.$showMsg()
				// 转存数据
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			goSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			},
			goList(val){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+val.cat_id
				})
			}
		
		
		}
	}
</script>

<style lang="scss">
	.search-box {
	  position: sticky;
	  top: 0;
	  z-index: 999;
	}
	.scroll-view-container {
		display: flex;
		

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				// 激活项的样式
				&.active {
					background-color: skyblue;
					position: relative;

					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}

		,
		.cate-lv2-title {
			font-size: 12px;
			color:#0B173B ;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}

		.cate-lv3-list {
			display: flex;
			flex-wrap: wrap;

			.cate-lv3-item {
				width: 33.33%;
				margin-bottom: 10px;
				display: flex;
				flex-direction: column;
				align-items: center;

				image {
					width: 60px;
					height: 60px;
				}

				text {
					font-size: 12px;
				}
			}
		}

	}
</style>
